But some users may find it difficult to stick with their current cards until then. Vending machines at rail stations are being replaced with Ventra machines. Some of the old machines that remain don't even work, which may persuade some riders to turn to Ventra before they are ready to switch.

This may be a problem for tourists and occasional riders who may not be aware that they pay $2.25 under the current system for a single rail ride ticket and $3 if they use a Ventra machine for the same ticket.

Chase described the first day of widespread Ventra use as "very smooth." The agency has had workers at stations talking to riders about the new system and answering questions.

"We know we're just at the beginning of really educating people about Ventra," Chase said. "It's time for people, if they haven't paid attention yet, to start paying attention."

Express yourself

The Metropolitan Planning Council, a civic group, is hosting a panel Wednesday about bus rapid transit, a form of express bus service that is coming to the Loop and Ashland Avenue. The event will be held from noon to 1:30 p.m., 140 S. Dearborn St., Suite 1400. Go to metroplanning.org for more information.